gas aluminium powder index
gas aluminium powder index
gas aluminium powder index , main is aluminium powder gas volume , this is is very obviously .
but during product light weight concrete block aslo very complex , only big volume not can get perfect gas hole .
if gas in early , then light weight concrete block will be use collapse , if gas in delay then will be have gas keep in side of AAC block , this is harmful for quality . therefore we need to consider aluminium powder gas charters .
1 water coverage is can be effect to aluminium powder particle size , water coverage is means aluminium powder permutation as below
particle size （um） | particle size （um） | Water coverage （cm2/g） |
200 | >200 | 900 |
150 | 150～200 | 1450 |
100 | 100～150 | 1660 |
90 | 90～100 | 2970 |
75 | 75～90 | 3440 |
60 | 60～75 | 4300 |
<60 | <60 | 6420 |
from this form you can be kown ,the smaller size , the watercoverage is bigger , but if too small size the Surface will be easy oxide , too small size the active aluminium will be lower too .
gas curve
normally should be use 70mg aluminium powder , temperature 45degree , use 50gram cement 30ML water , 30ML concentration at
0.1mol/l NaOH solvent then go to gas process . the final gas volume is gas curve
the request for aluminium powder
except aluminium powder, aluminium paste aslo can be use for AAC block , however aluminium powder is more safety more economic to use
the standard is JC/T407as follow form 2－4。
GLS-65 SOLID 65% 200MESH PASS 99% GAS RATE 30MIN